TF_ATTACH_DEBUGGER_ON_ERROR:
                           attach/stop in a debugger for all errors
TF_ATTACH_DEBUGGER_ON_FATAL_ERROR:
                           attach/stop in a debugger for fatal errors
TF_ATTACH_DEBUGGER_ON_WARNING:
                           attach/stop in a debugger for all warnings
TF_DEBUG_REGISTRY        : debug the TfDebug registry
TF_DISCOVERY_DETAILED    : detailed debugging of TfRegistryManager
TF_DISCOVERY_TERSE       : coarse grain debugging of TfRegistryManager
TF_DLCLOSE               : show files closed by TfDlclose
TF_DLOPEN                : show files opened by TfDlopen
TF_ERROR_MARK_TRACKING   : capture stack traces at TfErrorMark ctor/dtor, enable TfReportActiveMarks debugging API.
TF_LOG_STACK_TRACE_ON_ERROR:
                           issue stack traces for all errors
TF_PRINT_ALL_POSTED_ERRORS_TO_STDERR:
                           print all posted errors immediately, meaning that even errors that are expected and handled will be printed, producing possibly confusing output
TF_SCRIPT_MODULE_LOADER  : show script module loading activity
TF_TYPE_REGISTRY         : show changes to the TfType registry

